Infineon Technologies S27KL0643DPBHB023

Overview

S27KL0643DPBHB023 from Infineon is a 64Mb self-refresh DRAM (PSRAM) with octal xSPI interface, operating at 1.8 V or 3.0 V VCC/VCCQ, supporting DDR transfers up to 200 MHz clock rate and 400 MBps throughput. It integrates on-die refresh control, uses 24-ball FBGA package, and targets high-bandwidth, low-pin-count memory expansion in microcontroller-based systems requiring seamless SRAM-like access to DRAM density.

For engineers reviewing the S27KL0643DPBHB023 datasheet, S27KL0643DPBHB023 pinout, S27KL0643DPBHB023 application, or S27KL0643DPBHB023 equivalent, key selection criteria include xSPI octal timing compliance, RWDS strobe behavior during read/write, configurable burst lengths (16–128 bytes), hybrid sleep/deep power down current specs (12–15 µA), and AEC-Q100 Grade 2/3 qualification for automotive use.

Technical Context

This PSRAM implements an xSPI-compliant octal DDR interface with 11–12 signal lines (including optional CK#/RWDS/DCARS), where all data transfers occur on both edges of CK. Internal logic manages autonomous partial/full array refresh without host intervention, enabling SRAM-like command protocol while retaining DRAM density efficiency.

The device supports linear and wrapped burst modes (8–64 clocks), configurable output drive strength, and dual-voltage I/O (1.8 V/3.0 V). RWDS serves as bidirectional strobe-outputting refresh latency indicator at transaction start, acting as read data strobe or write mask-and optionally supports DDR center-aligned read strobe (DCARS) with phase-shifted timing to align transitions within the data eye.

Key Specifications

Pinout & Package

24-ball FBGA (5 × 5 array, 0.8 mm pitch) with ball pitch compliant to JEDEC MO-270CA. Package supports automated placement and thermal performance suitable for industrial and automotive applications.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar PSRAM applications.

Compared with S27KL0643DPBHB023, the Cypress alternative offers identical functionality with relaxed automotive grading, while Winbond's part trades octal bandwidth and advanced strobe control for simpler interface and lower cost-making it viable only in non-automotive, lower-performance designs.

Availability

S27KL0643DPBHB023 is available at Aetrix Electronics and suitable for automotive instrument clusters, industrial HMIs, edge AI sensor nodes, and portable medical monitors requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for S27KL0643DPBHB023 includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

Infineon Technologies is a German semiconductor manufacturer specializing in power management, sensing, connectivity, and memory solutions for automotive, industrial, and IoT markets.

The HYPERRAM™ product line delivers high-density, low-pin-count PSRAMs optimized for microcontroller-based systems needing SRAM-like simplicity with DRAM economics-targeting automotive displays, industrial HMIs, and edge AI acceleration.

FAQ

Does S27KL0643DPBHB023 require external refresh circuitry?

No. The device contains integrated self-refresh logic that autonomously manages partial and full array refresh operations between host transactions. The host only needs to observe maximum burst length limits and initial access latency indications via RWDS-no refresh commands or timing control are required.

What is the function of RWDS during a write transaction?

During write transactions, RWDS operates as a write data mask: each rising edge samples one byte of DQ[7:0], and the host asserts RWDS only for valid data bytes. This enables partial writes without read-modify-write cycles, reducing bus traffic and improving efficiency in sparse update scenarios like GUI element overlays.

Can S27KL0643DPBHB023 operate with a single-ended clock only?

Yes. The device supports single-ended CK input by default. CK# is optional and used only when differential clocking is needed for noise immunity in electrically noisy environments such as automotive powertrain or industrial motor drives. No configuration register changes are required to switch between modes.

How does DCARS improve timing margin in high-speed reads?

DCARS shifts the RWDS output phase by one-half CK cycle relative to standard RWDS, positioning its transition edge near the center of the read data eye. This increases setup/hold margin by up to 0.5 ns at 200 MHz, directly improving signal integrity and reducing bit error rates in layouts with trace skew or impedance discontinuities.